One or more oxides of nitrogen.
Heating blue colored copper nitrate in a boiling tube will cause it to undergo thermal decomposition, producing brown nitrogen dioxide gas, oxygen gas, and copper(II) oxide residue. The color change is due to the formation of copper(II) oxide. This reaction is a common demonstration of the decomposition of metal nitrates when heated.
Heating lead nitrate causes it to decompose, forming nitrogen dioxide gas which appears as brown fumes. This occurs due to the oxidation of nitrogen from the nitrate ion in the lead nitrate. Lead oxide is also formed as a residue after the reaction.
A redox reaction will occur, with copper displacing lead from the lead nitrate solution to form copper nitrate and lead. The copper will turn into a reddish-brown color due to the formation of copper ions in the solution.
Heating copper over a Bunsen flame will cause it to change color from its original reddish-brown to a dark brown/black color due to the formation of copper oxide on its surface. Continued heating can cause the copper to eventually melt and form a molten liquid.
Ferrous sulfate gives sulfur dioxide and a mixture of iron oxides when heating.
Heating blue colored copper nitrate in a boiling tube will cause it to undergo thermal decomposition, producing brown nitrogen dioxide gas, oxygen gas, and copper(II) oxide residue. The color change is due to the formation of copper(II) oxide. This reaction is a common demonstration of the decomposition of metal nitrates when heated.
Heating lead nitrate causes it to decompose, forming nitrogen dioxide gas which appears as brown fumes. This occurs due to the oxidation of nitrogen from the nitrate ion in the lead nitrate. Lead oxide is also formed as a residue after the reaction.
A redox reaction will occur, with copper displacing lead from the lead nitrate solution to form copper nitrate and lead. The copper will turn into a reddish-brown color due to the formation of copper ions in the solution.
When copper metal is placed in a solution of silver nitrate, a reddish-brown solid called copper(I) oxide is formed on the surface of the copper. This occurs due to a single displacement reaction where copper displaces silver from the silver nitrate solution.
A displacement reaction, in which the copper dissolves to form copper nitrate and replaces silver ions in the original silver nitrate, reducing the silver ions to metallic silver.
Heating copper over a Bunsen flame will cause it to change color from its original reddish-brown to a dark brown/black color due to the formation of copper oxide on its surface. Continued heating can cause the copper to eventually melt and form a molten liquid.
When copper nitrate is heated, it undergoes thermal decomposition, releasing brown nitrogen dioxide gas and leaving behind copper oxide as a residue. The reaction can be represented by the equation: 2Cu(NO3)2 -> 2CuO + 4NO2 + O2.
Ferrous sulfate gives sulfur dioxide and a mixture of iron oxides when heating.
It is important to note that with any type of mixture involving acid one should be extremely careful. When you mix copper with nitric acid you will get either nitrogen dioxide or nitric oxide.
The brown colored element, copper on heating in air forms copper oxide which in black in color. 2Cu(s) +O2(g) gives rise to 2CuO(s)
The brown ring test is a qualitative test used to detect the presence of the nitrate anion. In the test, a sample containing nitrate ions is treated with freshly prepared iron(II) sulfate solution and concentrated sulfuric acid. A brown ring at the junction of the two layers forms if nitrate ions are present.
When lead nitrate is heated, brown nitrogen dioxide gas is evolved, which gives off a yellowish-brown color.